Ground-glass frame for cameras



(No Model.)

M. FLAMMANG.

GROUND GLASS FRAME FOR. CAMERAS.

No. 245,808. Patented AugQ 16,1881.

UNITED STATES PATENT OFFICE.

MATHIAS FLAMMANG, OF NEWARK, NEW JERSEY, ASSIGNOR TO THE SCOVILL MANUFACTURING COMPANY, OF WATERBURY, CONNECTICUT.

GROUND-GLASS FRAME FOR CAMERAS.

SPECIFICATION forming part of Letters Patent No. 245,808, dated August 16, 1881.

Application filed May 25, 1881. No model.)

To all whom it may concern: the front face of two parallel edges rabbets Be it known that I, MATHIAS FLAMMANG, of the same depth, andin its two intermediate of Newark, in the county of Essex and State edges rabbets b of a different depth. of New Jersey, have invented certain new and When the ground-glass frame is inserted in useful Improvements in Means for Adjusting the back frame in such position that its rabbets and SecuringGround-GlassPlates and Frames 0 fit against'the rabbets a the ground-glass in the Back Frames of Photographic Cameframe will be supported in its rearmost posims, of which the following is a specification. tiou. It may then be secured in that position The object ofmyimprovements is to provide by manipulating buttons D, so that they will for placing the ground glass and ground-glass slip under and thus engage with straps E on frame employed in a photographic camera in the rear face of the back frame. When the either of two positions in the back frame, so ground-glass frame is reversed and inserted in as to adapt the camera for use with the process the back frame so that its rabbets 61 fit against of photography known as the wet-plate prothe rabbets b it occupies a position consideracess or the process known as the dry-platebl'y farther forward of its former position. It process. may then be secured in place by manipulating The improvements consist in the combinathe buttons D to cause them to engage with tion, with a back frame having in opposite recesses c in the top and bottom of the back edges rabbets or their equivalents of come frame. By thus providing for securing the sponding depth, of a ground-glass frame havground-glass frame in either of two positions ing rabbets of corresponding depth in paralin the back frame I provide for using it for lel edges and rabbets of a different depth in focusing for taking photographs by either the its intermediate edges, and adapted to be supdry-plate process or the wet-plate process, thus ported in either of two positions in the rabbets greatly enhancing the value of the camera comin the back frame, and means for retaining prising it.

said ground-glass frame in such positions. It is obvious that these improvements may In the accompanying drawings, Figure 1 is be applied to existing cameras at a trifling exa view of the rear side of the back frame, pense. ground-glass frame, and ground glass embody- In lieu of the rabbets, shoulders, ledges, or 0 ing my improvements. Fig. 2 is a transverse supports formed in other ways may be used.

section of the same on the line 90 m, Fig. 1. What I claim as my invention, and desire Fig. 3 is a transverse section at right angles to secure by Letters Patent, is to Fig. 2 and with the ground-glass frame re- 1. The combination, with a back frame havversedin position. Fig.4is a perspective view ing in opposite edges rabbets or their equiva- 5 of a corner of the back frame, and Fig. 5 is a lents of corresponding depth, a ground-glass perspective view of a corresponding corner of frame having in two parallel edges rabbets or the ground-glass frame. their equivalents of the same depth, andin its Similar letters of reference designate corretwo intervening edges rabbets of a different spondin g parts in all the figures. depth, whereby it is adapted to be secured in 40 The camera embodying my improvements the back frame in either of two positions, and may be of any approved style; hence I have means for securing said ground-glass frame in not deemed it necessary to represent it. position, substantially as specified.

A designates a back frame for a camera. It 2. The combination of the back frame, A, may be adapted to have any of the usual adwith its rabbets a, straps E, and recesses c, 4 5 justments. the ground-glass frame with its rabbets c and B designates a ground-glass frame, which is d, and the buttons D, substantially as speciremovably attached to the back frame A 5 and fied. C designates the ground glass. In the rear face of its side edges the back frame has rab- MATHIAS FLAMMANG' 5o bets a of corresponding depth, and in its up- Witnesses:

per and loweredges it has rabbets b of a dif- EDWIN H. BROWN,

ferent depth. The ground-glass frame has in A. O. WEBB. 

